ROSWELL, Georgia (CFP) — The most expensive U.S. House race in American history is drawing to a close, with Republican Karen Handel and Democrat Jon Ossoff making last-minute pitches in a special election runoff to fill Georgia’s vacant 6th District seat.

Polls in the June 20 runoff open at 7 a.m. and close at 7 p.m. EDT, with the results expected to draw outsized national attention.

A victory by Ossoff in a district the GOP has held for decades will be seen as a harbinger of potential doom for House Republicans in 2018. But a win by Handel would make Republicans three-for-three in winning House special elections this year, possibly tempering the speculation about how much President Trump’s historic unpopularity ratings are really eroding the party’s electoral health.

Fueled by liberal anger at Trump’s election, Ossoff — a 30-year-old filmmaker and former congressional aide seeking office for the first time — raised a staggering $23.6 million by the end of May, according to a report filed with the Federal Elections Commission. That figure doesn’t include any additional money raised during the first three weeks of June, as his runoff with Handel moved toward its climax.

Handel, a former Fulton County Commission chair and secretary of state, raised just $4.5 million by the end of May, although outside GOP-aligned groups have spent additional money on her behalf.

When all of the candidate and outside spending is tallied, the total is expected to approach $50 million, shattering all previous records for U.S. House races. To put that spending in perspective, a $50 million race would come to roughly $71 each for every man, woman and child in the district — and would be the equivalent of a $700 million statewide race in Georgia.

The 6th District arcs across Atlanta’s northern suburbs, taking in parts of Cobb, Fulton and DeKalb counties. Since its present configuration was drawn after the 1990 census, the seat has been held by Newt Gingrich, who went on to become speaker of the House; Johnny Isakson, who went on to the U.S. Senate; and Price, now in Trump’s Cabinet.

While Price won the district by 76,000 votes in November, Democrats smelled blood after Trump only managed to carry it by a scant 1.5 percent, on his way to becoming the first Republican to lose Cobb County since 1976. Trump also lost the March 2016 Republican primary in the district to U.S. Senator Marco Rubio of Florida.

Ossoff had initially begun his campaign with the slogan “Make Trump Furious.” But after coming in first in the April 19 primary, he eschewed nationalizing the campaign and sought to focus on district-specific issues.

Karen Handel, R. Georgia 6th District candidate

For Handel, 55, the second-place finish in the primary was a welcome political comeback after back-to-back losses to Governor Nathan Deal in a GOP runoff in 2010 and a Republican primary for the U.S. Senate in 2014. She served as secretary of state from 2007 to 2011 and as chair of the Fulton County Commission from 2003 to 2006.

Trump has not campaigned in person for Handel, although he did tape an anti-Ossoff robocall before the primary. But Vice President Mike Pence and Price both came down from Washington to make appearances on her behalf.